General

The v4.0.0 doc surface is now the only supported view of the Waves models. The version dropdown no longer offers v3.0.1 or v2.2.0, and the pages under those two versions have been removed from the docs site. Old bookmarked and search-indexed URLs 301-redirect to their v4 equivalents; where a specific v3.0.1/v2.2.0 page was renamed or merged in the v4 restructure, the redirect points at the closest v4 page (voice-cloning how-tos land on Instant Clone (API) etc.). The API-reference tabs on the retired versions rendered a completely different OpenAPI (Lightning v1/v2/large focused), so any auto-generated API-ref URLs on those versions land on the v4 API-ref authentication page.

Nothing changes at the API layer. The OpenAPI and AsyncAPI specs remain intact; SDK generation is unaffected. This is a docs-surface cleanup only. Customers running against the legacy POST /waves/v1/lightning-v2/* or POST /waves/v1/lightning-large/* routes continue to work exactly as before, and those routes’ current status is documented under the deprecated entries in the v4 changelog and via the response x-fern-availability: deprecated markers.